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Abstract:

A display apparatus and a control method which receives a user's input by
using a manipulation panel are provided. The display apparatus includes:
an image processor; a display unit; a user input unit which includes a
manipulation panel; and a controller which controls the display unit to
display a user interface (UI) including a number keypad upon receiving a
preset user's input from the user input unit and receives a user's
selection to select a channel number from the number keypad according to
a user's input to the direction key. Thus, the direction keys are
provided in the manipulation panel installed in a front or lateral side
of the display apparatus and a user may input a desired channel number
without difficulty when selecting channels through the manipulation
panel.

Claims:

1. A display apparatus comprising: an image processor which processes an
image signal; a display device which displays an image thereon based on
the processed image signal; a user input device which comprises a
manipulation panel , and which receives a user's input; and a controller
which controls the display device to display thereon a user interface
(UI) comprising a number keypad upon receiving a preset user's input from
the user input device, and receives a user's selection to select a
channel number from the number keypad according to a user's input to the
manipulation panel.

2. The display apparatus according to claim 1, wherein the manipulation
panel is provided in the display apparatus and comprises a plurality of
direction keys which correspond to four directions comprising a top
direction , a bottom direction, a left direction and a right direction.

3. The display apparatus according to claim 2, wherein the controller
recognizes a user's input to the manipulation panel as a command to move
in a direction of the number keypad which corresponds to a direction key
selected from the plurality of directions keys.

4. The display apparatus according to claim 1, wherein the preset user's
input comprises a combination of a plurality of keys located in the user
input device.

5. The display apparatus according to claim 1, wherein the controller
changes the display apparatus to a channel selection mode according to
the preset user's input and controls the display device to display
thereon the number keypad if the display apparatus is in a television
(TV) mode.

6. The display apparatus according to claim 1, wherein the user's input
to select the channel number selects at least one of numbers located in
the number keypad.

7. The display apparatus according to claim 1, wherein the controller
controls the display device to further display a display window which
displays a result of the user's input.

8. The display apparatus according to claim 1, wherein the controller
controls the image processor to process an image signal of a channel
which corresponds to the selected channel number and controls the display
device to display thereon an image corresponding to the processed image
signal.

9. A control method of a display apparatus comprising: receiving a preset
user's input from a user input device comprising a manipulation panel;
displaying a user interface (UI) comprising a number keypad; and
selecting a channel number from the displayed number keypad according to
a user's input to the manipulation panel.

10. The control method according to claim 9, wherein the manipulation
panel is provided in the display apparatus and comprises a plurality of
direction keys corresponding to four directions comprising a top
direction, a bottom direction, a left direction and a right direction.

11. The control method according to claim 10, wherein the selecting the
channel number comprises recognizing the user's input to the direction
keys as a command to move in a direction of the number keypad
corresponding to a direction key selected from the plurality of direction
keys.

12. The control method according to claim 9, wherein the preset user's
input comprises a combination of a plurality of keys located in the user
input device.

13. The control method according to claim 9, further comprising:
determining whether the display apparatus is in a television (TV) mode;
and changing the display apparatus to a channel selection mode according
to the preset user's input and displaying the number keypad if it is
determined that the display apparatus is in the TV mode.

14. The control method according to claim 9, wherein the selecting the
channel number comprises selecting at least one of numbers located in the
number keypad.

15. The control method according to claim 9, further comprising
displaying a result of the user's input in a display window.

16. The control method according to claim 9, further comprising:
processing an image signal of a channel corresponding to the selected
channel number; and displaying an image corresponding to the processed
image signal.

17. An image display apparatus comprising: a display device which
displays an image; and a manipulation panel which comprises a plurality
of directional keys and a power key, wherein the display device displays
a user interface (UI) comprising at least one of a number keypad and a
display window on the basis of an input to the manipulation panel.

19. The image display device of claim 17, wherein selected numbers on the
number keypad are moved according to a manipulation of the directional
keys.

Description:

CROSS-REFERENCE TO RELATED APPLICATION

[0001] This application claims priority from Korean Patent Application No.
10-2012-0027815, filed on Mar. 19, 2012 in the Korean Intellectual
Property Office, the disclosure of which is incorporated herein by
reference.

BACKGROUND

[0002] 1. Field

[0003] Apparatuses and methods consistent with the exemplary embodiments
relate to a display apparatus and a control method thereof, and more
particularly, to a display apparatus and a control method thereof which
receives a user's input by using a manipulation panel.

[0004] 2. Description of the Related Art

[0005] A display apparatus such as a television (TV) processes image
signals/image data transmitted by various external image supply sources
or stored in the display apparatus and displays an image on a display
panel. For example, a display apparatus which is provided to general
users may include a TV or a monitor. The display apparatus, which is
realized as a TV, processes a broadcasting signal transmitted from an
external source through various image processing operations such as
decoding and scaling operations and provides an image of a desired
broadcasting channel.

[0006] A user may select a desired channel by manipulating a user input
unit such as a remote controller. For example, a user may select a
channel by manipulating a number keypad in the remote controller and
inputting a desired channel (content) number.

[0007] Otherwise, a user may select a channel by manipulating a
manipulation panel provided in a display apparatus.

[0008] As the display apparatus becomes smaller and consumers prefer a
more aesthetic design, it is more difficult to provide a space for the
manipulation panel in the display apparatus. For example, if the
manipulation panel is provided in a front or lateral side of the display
apparatus, it is hard to design the manipulation panel because in recent
designs of display apparatuses, an external circumference (or bezel) of
the screen is designed to be narrower.

[0009] Generally, the manipulation panel is designed to have buttons
arranged in a row and to have a minimum number of buttons. For example,
buttons relating to a channel may have two buttons which are arranged
side by side to change a current channel to a previous channel (CH-) and
a next channel (CH+).

[0010] Thus, a user may change a channel in a sequential order only such
as changing a current channel to a previous or next channel. If a desired
channel is not adjacent to the current channel, a user has to repeatedly
manipulate a particular channel-change button until the channel is
changed to the desired channel, which is very inconvenient.

SUMMARY

[0011] The foregoing and/or other aspects may be achieved by providing a
display apparatus including: an image processor which processes an image
signal; a display unit which displays an image thereon based on the
processed image signal; a user input unit which includes a direction key
and receives a user's input; and a controller which controls the display
unit to display thereon a user interface (UI) including a number keypad
upon receiving a preset user's input from the user input unit and
receives a user's selection to select a channel number from the number
keypad according to a user's input to the direction key.

[0012] The direction key may be provided in the display apparatus and may
include a plurality of keys corresponding to four directions including
top, bottom, left and right sides.

[0013] The controller may recognize a user's input to the direction keys,
as a command to move in a direction of the number keypad corresponding to
a direction key selected from the plurality of directions keys.

[0014] The preset user's input may include a combination of a plurality of
keys included in the user input unit.

[0015] The controller may change the display apparatus to a channel
selection mode according to the preset user's input and may control the
display unit to display thereon the number keypad if the display
apparatus is in a TV mode.

[0016] The user's input to select the channel number may select at least
one of the numbers included in the number keypad.

[0017] The controller may control the display unit to further display a
display window displaying a result of the user's input.

[0018] The controller may control the image processor to process an image
signal of a channel corresponding to the selected channel number and may
control the display unit to display thereon an image corresponding to the
processed image signal.

[0019] Another aspect of the exemplary embodiments provides a control
method of a display apparatus including: receiving a preset user's input
from a user input unit including a direction key; displaying a user
interface (UI) including a number keypad; and selecting a channel number
from the displayed number keypad according to a user's input to the
direction key.

[0020] The direction key may be provided in the display apparatus and may
include a plurality of direction keys corresponding to four directions
including top, bottom, left and right sides.

[0021] The selecting the channel number may include recognizing the user's
input to the direction keys as a command to move in a direction of the
number keypad corresponding to the direction key selected from the
plurality of direction keys.

[0022] The preset user's input may include a combination of a plurality of
keys included in the user input unit.

[0023] The control method may further include determining whether the
display apparatus is in a TV mode; and changing the display apparatus to
a channel selection mode according to the preset user's input and
displaying the number keypad if it is determined that the display
apparatus is in the TV mode.

[0024] The selecting the channel number may include selecting at least one
of numbers included in the number keypad.

[0025] The control method may further include displaying a result of the
user's input in a display window.

[0026] The control method may further include processing an image signal
of a channel corresponding to the selected channel number; and displaying
an image corresponding to the processed image signal.

BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The above and/or other aspects will become apparent and more
readily appreciated from the following description of the exemplary
embodiments, taken in conjunction with the accompanying drawings, in
which:

[0028]FIG. 1 is a block diagram of a display apparatus according to an
exemplary embodiment;

[0029]FIG. 2 illustrates an example of a manipulation panel 20 installed
in the display apparatus according to an exemplary embodiment;

[0031] FIGS. 4 to 7 illustrate a number keypad displayed corresponding to
a selection of a direction key; and

[0032]FIG. 10 is a flowchart showing a control method of a display
apparatus according to an exemplary embodiment.

DETAILED DESCRIPTION OF THE EXEMPLARY EMBODIMENTS

[0033] Below, exemplary embodiments will be described in detail with
reference to accompanying drawings so as to be easily realized by a
person having ordinary knowledge in the art. The exemplary embodiments
may be embodied in various forms without being limited to the exemplary
embodiments set forth herein. Descriptions of well-known parts are
omitted for clarity, and like reference numerals refer to like elements
throughout.

[0034]FIG. 1 is a block diagram of a display apparatus 100 according to
an exemplary embodiment.

[0035] As shown therein, the display apparatus 100 processes an image
signal supplied by an external image supply source (not shown) according
to a preset image processing operation, and displays an image based on
the processed image signal.

[0036] The display apparatus 100 according to the present exemplary
embodiment includes a TV which displays a broadcasting image based on
broadcasting signals/broadcasting information/broadcasting data
transmitted by a transmission device of a broadcasting station. However,
the spirit of the exemplary embodiments are not limited to the foregoing
exemplary embodiment type of the display apparatus 100, to which various
types of exemplary embodiments displaying an image such as a TV may
apply.

[0037] The type of an image which is displayable by the display apparatus
100 is not limited to a broadcasting signal. For example, the display
apparatus 100 may display video, still images, applications and on-screen
display (OSD) based on signals/data supplied by various image supply
sources, and a graphic user interface (GUI) for controlling various
operations, but not limited thereto.

[0038] As shown therein, the display apparatus 100 includes an image
receiver 110 which receives an image signal, an image processor 120 which
processes an image signal received by the image receiver 110, a display
unit 130 which displays thereon an image based on the image signal
processed by the image processor 120, a user input unit 140 which
receives a user's input, a storage unit 150 which stores therein various
data, and a controller 160 which controls the display apparatus 100.

[0039] The image receiver 110 receives and transmits an image signal to
the image processor 120. The image receiver 110 may vary depending on a
standard of a received image signal and the exemplary embodiment type of
the display apparatus 100. For example, the image receiver 110 may
receive a radio frequency (RF) signal in a wireless manner from a
broadcasting station (not shown), or receive image signals in a wired
manner according to standards such as composite video, component video,
super video, SCART, high definition multimedia interface (HDMI), etc. The
image receiver 110 may include a tuner to tune a broadcasting signal by
channel if the image signal includes a broadcasting signal.

[0040] The image signal may be input from an external source, e.g., from
an external device such as a personal computer (PC), AV device, smart
phone, smart pad, etc. The image signal may result from data which are
received through a network such as the Internet. In this case, the
display apparatus 100 may further include a network communication unit
(not shown) which communicates through a network. The image signal may
result from data stored in a non-volatile storage unit 150 such as a
flash memory, a hard disc drive, etc. The storage unit 150 may be
provided within or outside the display apparatus 100. If the storage unit
150 is provided outside the display apparatus 100, the display apparatus
100 may further include a connector (not shown) to which the storage unit
150 is connected.

[0041] The image processor 120 performs preset various image processing
operations with respect to an image signal. The image processor 120
outputs the processed image signal to the display unit 130 to display an
image on the display unit 130 based on the image signal.

[0042] The image processing operations of the image processor 120 include
a decoding operation corresponding to various image formats, a
de-interlacing operation, a frame refresh rate conversion operation, a
scaling operation, a noise reduction operation to improve an image
quality, a detail enhancement operation, and a line scanning operation,
but is not limited thereto. The image processor 120 may be realized as a
group of individual elements which may individually perform the foregoing
operations, or as a system-on-chip (SoC) which integrates such
operations.

[0043] The display unit 130 displays thereon an image based on an image
signal processed by the image processor 120. The display unit 120 may
include liquid crystal, plasma, light-emitting diode, organic
light-emitting diode, surface-conduction electron-emitter, carbon
nano-tube, and nano-crystal, but is not limited thereto.

[0044] The display unit 130 may further include additional elements
depending on its exemplary embodiment type. For example, if the display
unit 130 includes liquid crystal, it may further include a liquid crystal
display (LCD) panel (not shown), a backlight unit (not shown) emitting
light to the LCD panel, and a panel driving substrate (not shown) driving
the LCD panel.

[0045] The user input unit 140 transmits preset various control commands
or unlimited information to the controller 160 by a user's manipulation
and input. The user input unit 140 may be realized as a manipulation
panel 20 (FIG. 2) including a button such as a menu key (not shown)
installed in an external side of the display apparatus 100 or may be
realized as a remote controller that is separated from the display
apparatus 100. If the user input unit 140 includes a remote controller,
there is no restriction in transmitting a user's input from the user
input unit 140 to the controller 160, and a wireless communication may be
used. The wireless communication includes infrared communication, RF
communication, etc. In this case, the display apparatus 100 may further
include a communication module (not shown) which receives a signal
corresponding to a user's input from the user input unit 140 and
transmits the signal to the controller 160.

[0046] The user input unit 140 which is realized as the manipulation panel
20 according to the present exemplary embodiment includes a plurality of
direction keys 21, 22, 23 and 24 as shown in FIG. 2.

[0047]FIG. 2 illustrates an example of the manipulation panel 20
installed in the display apparatus 100 according to an exemplary
embodiment.

[0048] In FIG. 2, the manipulation panel 20 is provided in a lateral side
of the display apparatus 100. However, this is an example and the
manipulation panel 20 may be displayed in other locations including a
rear, upper, lower or front side thereof. In FIG. 2, the manipulation
panel 20, including the plurality of direction keys 21, 22, 23 and 24,
has a circular shape, but this is an example, and the manipulation panel
20 may have other shapes including, but not limited to, a cross or
lozenged shape.

[0049] As shown therein, the direction keys 21, 22, 23 and 24 according to
the present exemplary embodiment include a top key 21, a bottom key 22, a
left key 23 and a right key 24.

[0050] The bottom and top keys 22 and 21 may be set to receive a command
for sequentially changing a current channel to an adjacent previous
channel ((CH-) 22) and a next channel ((CH+) 21) corresponding to a
user's manipulation for the direction key. The left and right keys 23 and
24 may be set to receive a command for increasing a volume ((VOL+) 23) or
decreasing a volume ((VOL-) 24) corresponding to a user's manipulation
for the direction key.

[0051] The manipulation panel 20 according to the present exemplary
embodiment may further include a power key 25. The power key 25 may have
a circular shape and may be provided in a center of the direction keys
21, 22, 23 and 24, but is not limited thereto in location and shape.

[0052] The user input unit 140 may include a user interface (UI) which is
displayed on the display unit 130 to receive a user's selection. The UI
according to the present exemplary embodiments includes a number keypad
(hereinafter, to be also called "dial OSD") shown in FIGS. 3 to 9, and a
display window 40 displaying a result of a user's input. If the display
unit 130 includes a touch screen, the user input unit 140 may transmit to
the controller 160 a command corresponding to a user's input which is
generated by a user touching the UI of the display unit 130.

[0053] A user may manipulate the direction keys 21, 22, 23 and 24 provided
in the manipulation panel 20 and select a UI displayed on the display
unit 130. In the present exemplary embodiment, a user manipulates the
direction keys 21, 22, 23 and 24 of the manipulation panel 20 as the user
input unit 140 and selects the UI displayed on the display unit 130.
However, the spirit of the exemplary embodiments are not limited to the
foregoing case, and a user's input may be generated through various other
means including, but not limited to, a remote controller.

[0054] The storage unit 150 stores therein unlimited data according to a
control of the controller 160. The storage unit 150 includes a
non-volatile storage medium such as a flash memory and a hard disc drive.
The storage unit 150 is accessed by the controller 160, and data are
read/recorded/amended/deleted/updated by the controller 160.

[0055] The data stored in the storage unit 150 include, e.g. an operating
system for driving the display apparatus 100, and other various
applications, which are executed in the operating system, and image data
and additional data.

[0056] The storage unit 150 according to an exemplary embodiment further
stores therein operation mode information of the display apparatus 100,
and setting information for the plurality of direction keys 21, 22, 23
and 24 and the power key 25 with respect to a predetermined operation
mode. The operation mode may include a TV mode, a channel selection mode,
an external input mode, and a USB connection mode.

[0057] The setting mode may be set for the bottom and top keys 22 and 21
to receive a command for sequentially changing a current channel to an
adjacent previous channel ((CH-) 22) and a next channel ((CH+) 21). The
left and right keys 23 and 24 may be set to receive a command to increase
the volume ((VOL+) 23) and decrease the volume ((VOL-) 24). The power key
25 is set to receive a command for turning on or off the display
apparatus 100.

[0058] The setting information according to an exemplary embodiment may be
set to move a selection item of the number keypad 30 (FIG. 3) displayed
on the display unit 130 in a corresponding direction according to a
manipulation of the direction keys 21, 22, 23, and 24 in the channel
selection mode. For example, if a user selects the top key 21 while the
display apparatus 100 operates in the channel selection mode, the
selection item of the number keypad 30 is changed to a selection item
located above the current selection item.

[0059] The power key 25 may be set to perform a click or enter function
with respect to an item selected by the manipulation of the direction
keys 21, 22, 23 and 24 in the channel selection mode.

[0060] The display apparatus 100 according to an exemplary embodiment
recognizes a user's input to the keys of the manipulation panel 20
differently in the channel selection mode from in the remaining operation
mode.

[0061] The setting information according to an exemplary embodiment
further includes mode change information which is set to change the
display apparatus 100 to a channel selection mode by a preset user's
input of the manipulation channel 20. The preset user's input may include
a combination of a plurality of keys of the user input unit 140, i.e.,
the manipulation panel 20.

[0062] For example, the mode change information may be set to change the
operation mode of the display apparatus 100 to the channel selection mode
if the power key 25 and the right key 24 are selected simultaneously. The
set combination of the keys is not limited to the power key 25 and the
right key 24, and may vary including a simultaneous selection of a
plurality of keys and a sequential selection of the keys at a
predetermined time interval.

[0063] The controller 160 performs control operations for various elements
of the display apparatus 100. For example, the controller 160 controls
entire operations of the display apparatus 100 by controlling the image
processor 120 to process an image and by performing a corresponding
control operation with respect to a command of the user input unit 140.

[0064] More specifically, referring to FIG. 3, upon receiving a preset
user's input (e.g. simultaneous selection of the power key 25 and the
right key 24) through the user input unit 140, the controller 160 changes
the operation mode of the display apparatus 100 to the channel selection
mode and controls the display unit 130 to display thereon a UI including
a number keypad 30. Upon receiving the preset user's input while the
display apparatus 100 operates in the TV mode, the controller 160 may
change the operation mode to the channel selection mode.

[0065] The number keypad 30 is displayed in a predetermined location of
the display unit 130. According to an exemplary embodiment, the number
keypad 30 is located in a right bottom of the display unit 130 which is
adjacent to the manipulation panel 20 for a user to identify the
selection item to manipulate the direction keys 21, 22, 23 and 24. The
location of the number keypad 30 may be changed depending on the location
of the manipulation panel 20, and is not limited to the location shown in
the drawing.

[0066] The controller 160 controls the display unit 130 to highlight and
display a selection item (number) from the number keypad 30. As a
highlight, the controller 160 may control the display unit 130 to focus
on the selection item. However, the exemplary embodiment is not limited
to the foregoing case, and various processing methods including pointer,
cursor, highlight, and flickering may apply. A user may easily recognize
the highlighted item in the number keypad 30, as the current selection
item.

[0067] FIGS. 3, 8 and 9 illustrate a screen displayed on the display unit
130, and FIGS. 4 to 7 illustrate the number keypad 30 displayed
corresponding to a selection of the direction keys 21, 22, 23 and 24.

[0068] As shown therein, the number keypad 30 includes a plurality of
number keys 31, 34, 35 and 36, an OK key 32 and a CANCEL key 33.

[0069] The controller 160 receives a user's selection to select a channel
number from the number keypad 30 displayed according to a user's input to
the direction keys 21, 22, 23 and 24. The controller 160 recognizes the
user's input to the direction keys 21, 22, 23 and 24 as a command to move
in a direction of the number keypad 30 corresponding to a direction key
selected from the plurality of direction keys 21, 22, 23 and 24.

[0070] For example, if a user selects the top key (CH+) 21 while the first
item 34 is selected as in FIG. 4, the controller 160 changes the
selection item of the number keypad 30 to a second item 35 provided above
the first item 34 which has been selected currently. The controller 16
may highlight and display the selected item, i.e., the second item 35.

[0071] Likewise, if a user selects the bottom key ((CH-) 22) while the
first item 34 is selected as in FIG. 5, the controller 160 changes the
selection item of the number keypad 30 to a third item 36 provided below
the first item 34. The controller 160 may highlight and display the third
item 36.

[0072] If a user selects the left key ((VOL-) 23) while the first item 34
is selected as in FIG. 6, the controller 160 changes the selection item
of the number keypad 30 to a fourth item 37 provided in the left side of
the first item 34. The controller 160 may highlight and display the
fourth item 37.

[0073] If a user selects the right key ((VOL+) 24) while the first item 34
is selected as in FIG. 7, the controller 160 changes the selection item
of the number keypad 30 to a fifth item 38 provided in the right side of
the first item 34. The controller 160 may highlight and display the fifth
item 38.

[0074] A user may select a desired number from the number keypad 30
through the direction keys 21, 22, 23 and 24 of the manipulation panel 20
and select the channel more easily by using the manipulation panel 20.

[0075] The controller 160 controls the display unit 130 to further display
a display window 40 displaying a result of a user's input as in FIGS. 8
and 9. In FIGS. 8 and 9, the display window 40 is displayed on a left top
of the display unit 130, but not limited thereto.

[0076] For example, if a user selects the number 1 (31, FIG. 8) from the
number keypad 30 through the direction keys 21, 22, 23 and 24 and
manipulates the power key 25 while the number keypad 30 is displayed as
the display apparatus 100 is changed from the TV mode to the channel
selection mode through a user's input, the controller 160 displays the
selected number 1 in the display window 160 ((a) in FIG. 8). If a user
manipulates the power key 25 again while the number 1 (31) is selected,
the controller 160 controls the display unit 130 to display a number 11
as an input result in the display window 160 ((b) in FIG. 8). If a user
moves the selection item in the number keypad 30 to the OK key 32 through
the direction keys 21, 22, 23 and 24 and manipulates the power key 25
((c) in FIG. 8), the controller 160 determines that the selection of the
channel number 11 has been completed and controls the display unit 130 to
discharge the channel selection mode and to disable the number keypad 30
((d) in FIG. 8).

[0077] The controller 160 controls the image receiver 110 to receive an
image signal of a channel corresponding to the selected channel number
11, and controls the image processor 120 to process the received image
signal. The controller 160 controls the display unit 130 to display
thereon an image corresponding to the processed image signal. The
controller 160 controls the display apparatus 100 to return to the TV
mode.

[0078] A user may amend the selected channel number by using the CANCEL
key 33. For example, when a number 1 is displayed in the display window
160 by a user's selection of the number 1 (31) as in (a) in FIG. 8, if a
user manipulates the right key 24 and the power key 25, the controller
160 controls the display unit 130 to display a number 12 as an input
result in the display window 160 ((a) in FIG. 9). If a user moves the
selection item in the number keypad 30 to the CANCEL key 33 through the
direction keys 21, 22, 23 and 24 and manipulates the power key 25, the
controller 160 controls the display unit 130 to delete from the display
window 40 the number 2 which has most recently been selected ((b) in FIG.
9).

[0079] A user may move the selection item to a desired number and click
the number by manipulating the direction keys 21, 22, 23 and 24 and the
power key 25 and select the channel number as in (b) to (d) in FIG. 8.

[0080] Hereinafter, a control method of the display apparatus 100
according to the present exemplary embodiment will be described with
reference to accompanying drawings.

[0081]FIG. 10 is a flowchart showing a control method of the display
apparatus 100 according to an exemplary embodiment.

[0082] As shown therein, the display apparatus 100 may operate in the TV
mode (operation S502).

[0083] The controller 160 determines whether a preset user's input is
received with respect to the manipulation panel 20 as the user input unit
160 in the TV mode (operation S504). The preset user's input may include
a combination of the direction keys 21, 22, 23 and 24 and the power key
25 of the manipulation panel 20.

[0084] If the preset user's input is received at operation 5504, the
controller 160 changes the display apparatus 100 to the channel selection
mode (operation S506).

[0085] The controller 160 controls the display unit 130 to display thereon
the UI including the number keypad 30 (operation S508).

[0086] The controller 160 recognizes a user's input to the direction keys
21, 22, 23 and 24 as the command to move the selection item of the number
keypad 30 in a direction displayed at operation 5508 (operation S510).
The controller 160 controls the display unit 130 to display thereon the
selected channel number in the display window 40 and to disable the
number keypad 30 if the selection of the channel number is completed, and
controls the display apparatus 100 to return to the TV mode.

[0087] The controller 160 controls the image receiver 110 and the image
processor 120 to receive and process an image signal of the channel
number selected at operation 5510 (operation S512).

[0089] If the preset user's input is not received at operation 5504, the
display apparatus 100 continues to operate in the TV mode, and the
controller 160 performs a preset operation to the direction keys 21, 22,
23 and 24 and the power key 25 (e.g. the bottom and top keys 22 and 21
sequentially change the channel to the adjacent previous channel ((CH-)
22) and next channel ((CH+) 21) and the left and right keys 23 and 24
raise the volume ((VOL+) 23) or lower the volume ((VOL-) 24) and the
power key 25 turns on or off the display apparatus 100) (operation S516).
Even if the display apparatus 100 is not in the TV mode, e.g., is in an
external input mode, the controller 160 may perform the preset operation
to the direction keys 21, 22, 23 and 24 and the power key 25 as at
operation S516.

[0090] In the exemplary embodiment, the number keypad 30 is displayed and
a user selects the channel through the direction keys 21, 22, 23 and 24,
but is not limited thereto. The exemplary embodiment may apply to the
case where a letter keypad is displayed and a letter is input through the
direction keys 21, 22, 23 and 24 and the result is displayed in the
display window 40.

[0091] According to the exemplary embodiment, the direction keys 21, 22,
23 and 24 are provided in the manipulation panel 20 installed in a front
or lateral side of the display apparatus 100, and a user may input a
desired channel number without difficulty to thereby reduce inconvenience
in selecting channels through the manipulation panel 20.

[0092] The display unit 130 displays the display window 40, and also
displays the number keypad 30. The display unit also displays a result of
a user's selection which improve convenience in manipulating the
direction keys 21, 22, 23 and 24.

[0093] Although a few exemplary embodiments have been shown and described,
it will be appreciated by those skilled in the art that changes may be
made in these exemplary embodiments without departing from the principles
and spirit of the application, the range of which is defined in the
appended claims and their equivalents.